Add `testbed:surveys` task.
Add `testbed:surveys` task.

This task loads all the sample surveys into the testbed app for easier manual
testing.

serracorwin/surveyor,blueboard/surveyor,HeHStudy/surveyor,alanjcfs/surveyor,anitsirc/surveyor,Guestfolio/surveyor,serracorwin/surveyor,risuiowa/surveyor,Guestfolio/surveyor,risuiowa/surveyor,HeHStudy/surveyor,risuiowa/surveyor,lampo/surveyor,markedmondson/surveyor,risuiowa/surveyor,anitsirc/surveyor,fhisamoto/surveyor,blueboard/surveyor,alanjcfs/surveyor,Guestfolio/surveyor,lampo/surveyor,fhisamoto/surveyor,bricesanchez/surveyor,NUBIC/surveyor,Guestfolio/surveyor,fhisamoto/surveyor,blueboard/surveyor,lampo/surveyor,HeHStudy/surveyor,bricesanchez/surveyor,serracorwin/surveyor,fhisamoto/surveyor,anitsirc/surveyor,bricesanchez/surveyor,NUBIC/surveyor,HeHStudy/surveyor,anitsirc/surveyor,alanjcfs/surveyor,markedmondson/surveyor,alanjcfs/surveyor,blueboard/surveyor,lampo/surveyor,NUBIC/surveyor,markedmondson/surveyor,bricesanchez/surveyor